 demonstration of the anterior compartment of the leg. This is the supine cadaver right leg. I'm speaking from the right side The camera person is also on the right side. This is the anterior compartment It is bounded by the anterior border of the TBR here, which is subcutaneous and it is bounded by the anterior intermuscular septum, which we can see here. The first muscle that we have picked up here This is the TBRL's anterior It's a very powerful and a very strong muscle and the tendon gets inserted onto the medial aspect of the medial Cuniform and the base of the first metatarsal. This is a powerful dorsiflexor and Inverter of the foot. If there is paralysis of this muscle, then there is foot drop, which is a very serious disability The next muscle that we can see in the anterior compartment is this one here This is the extensor halosus longus, which is right next to the TBRL's anterior And we can see the tendon goes all the way to the tip of the distal phallus of the great toe This extensor halosus longus, as it implies, is responsible for extension of the great toe till the terminal phallus Then we have this muscle here, which we have picked up. This is the extensor Digitorum. The tendon fans out and gets inserted onto the distal phallus of the second, third, fourth and fifth toes And just lateral to that with the muscle However, there is a distinct separate muscle and that is this one here. This is the fibularis tercius We can recognize the fibularis tercius by its unique insertion onto the base of the fifth metatarsal It has got a split out insertion. This is an inverter of the foot However, it is an anterior compartment and it is supplied by the nerves of the anterior compartment So these are the muscles that we can see in the anterior compartment. Now, let me mention something about the retina column here Part of that we have retained here. Stretching across the ankle, we have two tough facial structures Which are extensions of the fascia cruris This one, this is the superior extensor retina column, which extends across rectangular and there is a lower one here, which is in the shape of a Y. The medial portion splits into a Y The superior one is the tougher one and we can see part of that here It's almost as tough as a cartilage And this is the one which holds these tendons and prevent them from both stringing when the foot is dorsiflexed And as it stretches across these tendons, which are incidentally covered by salivary We have cut them. There are septic, fibrous septic which go into the tarsal bones and therefore convert each passage into a small tunnel through which these tendons pass Now let's come to the neurovascular structures. The neurovascular structures are visible between the tibialis entry and the extensor Halus is long as here and we have picked them up here. More specifically It is the anterior tibial artery and the deep fibular nerve The anterior tibial artery is one of the terminal divisions of the bubletial fossa And this supplies all the structures here in the anterior compartment And it also gives branches to the lateral compartment. The deep fibular nerve is a larger branch of the common fibular Which starts from the lateral aspect of the neck of the fibula And it divides into a deep and superficial and this is the deep fibular branch This is the one which supplies all the muscles of the anterior compartment. The tibialis anterior Extensor Halus is long as, Extensor Digitorum and Fibular Astertius Injury to this nerve can lead to paralysis of all the muscles here And as I mentioned, the paralysis of the tibialis anterior will produce the most serious disability Namely foot trauma. The patient will not be able to torsiflex the foot against gravity Injury to this nerve is not very common because it is located deep However, the common fibular nerve that is running around the neck of the fibula Can be injured in fracture of the neck of the fibula or any surgery or any injury to the battle side of the knee In which case the result will be the same paralysis of the deep fibular nerve These two structures the deep fibular nerve and the anterior tibial artery Then they continue on to the dorsal of the foot This neurovascular structure that we see here in this particular case We are noticing that it is entering the foot between the tibialis anterior and the Extensor Halus is long as In the textbook the typical description is like this The anterior tibial artery continues just lateral to the Extensor Halus is long as So this is what we noticed in this particular section At this juncture, let me mention some few clinical correlations This deep fibular nerve can get entrapped under the Extensor etnicular Which as we can see is a very tough structure here And that condition especially occurs in the skiers who wear tight boots and they tie the shoelace tightly across the dorsal of the foot In which case that compounds the compression of the deep fibular nerve and that is known as ski boots in Rome As we can see this tibia This is the anterior border of the tibia This is the medial border of the tibia the medial surface of the tibia is the butaneous The junction between the lower one third and the upper two thirds of the tibia is the weakest point And therefore that is the site of most common which is fractured Fracture of the tibia is quite often compound that is it pierces through the skate because this portion is subcutaneous Second point to be remembered is fracture of the tibia is quite often accompanied by fracture of the fibular There is a special type of fracture which is referred to as a boot top fracture Which usually occurs at the upper margin of a calf-length boot This is a plain x-ray to show a boot top fracture with overriding of fragments and shortening of the leg The tibia can also be subject to what is known as stress fracture Which also usually occurs in the lower one third of the tibia those people who are marching like for example soldiers However, stress fracture can also occur in the upper part of the tibia Stress fractures sometimes are not visible on plain x-ray in which case a special investigation like MRI may be required Then we have something called shin split The anterior aspect of the leg is the shin And there is if there is continuous or repetitive or trauma that these muscles can swell up These muscles were enclosed in a tight fascia and that part of it that we have retained here That is known as the blue fascia Which is attached to the tibia So if these muscles expand swell up within the tight osteo-facial compartment And if it is untreated it can progress to what is known as anterior compartment syndrome Where the compression of the muscles will jeopardize the blood supply Anti-tibial artery in such situations What we have to do is we have to cut open the deep fascia and that is known as fasciotomy Only then we can relieve the pressure. These are some of the points which I wanted to mention About the anterior compartment of the leg. Thank you very much for watching. If you have any questions or comments Please put them in the comment section below. Dr. Sanjay Sanyal signing off. Have a nice day